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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9afcbea934b61f7bc459c7f03e476ef0a46994e4d2a0cf3cd9163cbd73b7701' 
  AND token = '1+/NIJcZcT4xl35p2aXuJ+Lr9ElH2Ofmv+nLsf+y2hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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