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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71e13526e067266824b93be65ff777b4e0ef0e2f6d1b127deed868c6b5e3cf1' 
  AND token = '7C5tfJuBOf+Tahl4NUdAA955pr7qKrb+rq+zUVx+b2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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