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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30fefffc2c04086fe0d40303022c511201ccf584b08ebdfa3fee58209622f1d' 
  AND token = '+B+n/2D0PIUMK/6VxeXAsQj3NYE3uBCb82qPe3t+p5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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