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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95549ed88b91b7a3aa240f3e73a54905e4471fdc29e153127915a23538cda6a' 
  AND token = 'SjIHchGTokwGSdSh02UD9wFlwNHJ89VAmbqse+8+udk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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