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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61acdd9f5c668099ee60a2c66ccb42f402e32c451b66d6205c31d11d18077472' 
  AND token = 'XuS5FTIr2U9FH7/Kav2ndTq1GvNS4BGTjhWBjglCqpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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