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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bcb810c6df98c5aff0c64f32834d1b778613fe84d072c4b562794607b45b06e' 
  AND token = 'MRhxkn4h8haYU7u3u2eOELHBwEg0ycoI/Irc2zKYyps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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