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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36088ca7254812efab1c607c3adc7a02571cf9fa1eab495e460e83babc4e7f30' 
  AND token = 'NIHxXIlUHOADccBSHsLGpF50KwMXrt8Q7RGNchmZ+fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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