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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e0e82423b9da6fcd8a965dd386cfefb37c66e319981ba4d35fdda2d3425fd6' 
  AND token = '0vATKbDA7PmkxvHZR3D7iijND27B26kBcgW8EUTqpPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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