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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e3e5b6b5ed869447782b182591a9e43f0c12d598854085eb54d4fe9b3561c9' 
  AND token = '3Ms91gr0ok/jem1cCgvwZWh1SYP85clGwBTY4aRGwfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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