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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac0b7411d19239e12c28ed9e379797014dace8783d77a0533ea1e461e2976113' 
  AND token = 'h/Cl4KL3nvWb1CI85gfrIlNjkf9mdoqFT11ZDnYmpbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}