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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec6d647f50671fa4c67f7531bd888b3fe644107be5584490b1ab2e244b027f4' 
  AND token = 'k3uIUgqYkNlntelR0sV67tWOzkva3Fv/sYrajzjgkv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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