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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9806732cf17eec564c385206c687716de0e01fface1ed34d2be3db15541774' 
  AND token = 'GE9M8F1EH9nKra6+f90vpPgkl2fKiZNz/F2VTKE1VQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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