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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c4804e57a8617e7f80cf3a7a78e2256b051cf05fcbeeca420b22f7382fcbc5' 
  AND token = '0PlpPL++RxRzTHGOaVKJ4kRmqrk6/SzQnc/l123R+Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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