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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fbf2cbaca08c49b854d90afff8bcc74176547605ae1b2b5d4c4fcb0b4083215' 
  AND token = 's0r7D39pOV2xvaBXFJeExTKaxxtfD1cBzRtt84W8uJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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