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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2063cadd1184bb57d1ae3d85071d929fc9313f45ca80bdc2948d6e0617d3114' 
  AND token = '84jpolYLKt6Ymjb1oKlliWUSUxDU4BFFF6hKMr2WGDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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