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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93901c67fe01baa476738dbca801cf09efef1e52914145a3768612d873ed0514' 
  AND token = 'V2fwqPGH8mcbn+XbMc+wAGjcRbbHYmd9aeC3eDHEl/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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