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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bcfe5e9bbcf4ddc84a13c7e78167ed358e38e5e34280048fd859703ce3748d2' 
  AND token = 'y8TTdevWakXvwo408E4bplJuP5JjSmBhnGFOej2vtHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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