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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ba695022147b733a4177df1cee2b42446cbbe9ee2f0ccb1bbcbc99a5ff2c5a' 
  AND token = 'RR9zEf0b2sS1CxP/2SEAdTTCAsksQRYk0lcFe6thCGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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