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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ec45e91f8570ed02c32ec8431079852bcf2df4a3aa32edaaf265c96d13fc3b' 
  AND token = 'gROjo1oyMXOEwH5f5hyR75Cl0VBnfccMF/0KX7g5wks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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