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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69fea4345c9cf58af942a551bbc814238fa2405154ea117da7b670a3107db0d0' 
  AND token = 'Bn99UOH0rJhabRLka4TdJ13Skpipuq55v0Um3I25tvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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