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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31221f36a9a69e1a2504761e2ba0e4e9a75d485814979f37b370206d3698676' 
  AND token = '5kSMhyE8l0kxNuCHKjaUvx7IOg//PPG3NdxsDytmMC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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