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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '714d1c82fe62906758d7adac87b7cf95ee265997f73a37ab7f1a352de85939a4' 
  AND token = 'sFvA4WstfC7o/ue04ioqfPC9AHHF+GuUK/j3/PMJWPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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