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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c66d80935c9c3780b67a3cfbba433946656e19c271ce7201b6a8795d2a660916' 
  AND token = 'cYDq6+vF3m/0cuKA44Xwc6itn+aB42KbLS8P87gN704=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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