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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2654c7a79450a417b89e72e4d4781e74b459afbca185d937f2cfc89faf65f9c9' 
  AND token = '6ZExkVA2hzeKjE3d9972Pt1RlKlLgJlC2/U7etZa4n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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