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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e32475d17a9e1e758f8f8b428e0f7c46ece1b6207867823e1494f23c4fe577b4' 
  AND token = 'fFqomFnQPyCSCmllZdzF+7ighv1rAGK4csWDSgW1hLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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