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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f40c86b0426476d27b6907779cc02a58e57ad68a1736eae709e7fc8af49bea' 
  AND token = 'qM63ZtyN/OzFANsO8e5sgybe+ugYk7CEC93QPcSQELA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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