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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f027e5adaa3526d1d908d26bd2a45bd51223ff1a1feeeed60e141e665c4fbe95' 
  AND token = 'WWx6Lm1w8EO7M49oiC62U0eqA/TpOrAbQoiermcE7po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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