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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85da8a8ad1499549070e888344e314bd4c76432e6923dd930d756b84c1a3c87c' 
  AND token = 'vQYZl3W4tbS44yaXrW38A5+d1u/HlQPB7nIx4sSscxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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