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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c8b37f82e4da31c1773bed264375e6ad96b9b776d26c1d257351a9c06ee1fb' 
  AND token = '8KmL4/Q5v81ao/8xr5fYxBFfr+vctHtdtaXbWXQkBkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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