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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8288af75e1505be12ab1f138772c1bf265f07658dad9d82b6fcf2f1c2e60e1' 
  AND token = 'zj468155y4J0DYW7b1Ffv0ryPgLuKX8fkOBCQnGEVCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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