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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88321aed093454bdc367aaa0f2620c9b5e7a6379880bbcdbc8f756144944882' 
  AND token = 'rL2kHX2q3SaGuB0qL5gQIByJ2x8OQQb6ZT47vCryWTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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