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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be316258d36bb10b6914ab33c7d59d8b1d4cf8c5f5ed936c32f1cdc03c724cc' 
  AND token = 'rDtQabAlPqgeyr7D5twXYJTpRT16QvSBe4/wxXLbskE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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