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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65c2af73eed1c69aff896e277f3f92f4670984d5a97546f7dffc89a771955a66' 
  AND token = 'G5P0bTQCLt/ZYcc5TXyAirB1PjXZKe3M4ra65jBVrxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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