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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a93890be91e0fab41da37d2db9992accba3f0c3dd90311a181da6414e3c350d' 
  AND token = 'LGIH5vZQRokuywx1gBH9z53AscWNdyBVGrKx14O2yHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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