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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '587638882bd9cad96809340f5512d0718e2e85c8329909627869cc2f1771aa24' 
  AND token = '+cDlQmzMbIGwfnEdwSZiDMHxcRTttfhBS2f5JLpR6l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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