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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b1d652a39fdf51beb00de3f767c55340c4894e5d0112ae61574c7aa8d8ee3b' 
  AND token = '4cEADjEEpEJV0vCF6hfrr7naDzfb4NDH44MhaDKOIP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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