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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05c62f5d3093cfbe4e6a1ab80038429c3fcc42bf087000a5aa6d5ffc319794b' 
  AND token = '9raObskl9P9EzzNlclYqov2d+xD8IPBaAKybpmGu+vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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