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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038062ad183c7bad561fc041e0ae322e02fb30dd6b58b076d38925098f352ba5' 
  AND token = 'Fios1LfJe03DbEXQcGYSZlgdEIw6h5C3S4kj+Eosyn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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