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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2855aa7fee7bb90db99c750b85b07c8c7d8ca3ae2180f881bf9b8035c61ff40b' 
  AND token = 'nDI9vjO0yzh4RERnb5SjNiLwcJTpM09jK9TuFTFIv7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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