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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ff0d98f50257602238d2f21ea6744a03997ca850d6d847bc60e8a8e52bd090' 
  AND token = 'nKBlVN2j6mMz98Ud68umIfZE/uO3T0s9QkFGbSqe0YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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