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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3318b650eac39b1bae3f0716a2d51fdf0035cfe88f0e59a04d1024c54367d96' 
  AND token = 'lFqzBICitJdMaIxQ8SNTmWFC2TQ1SOyF2MS4CIWKAwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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