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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddffa3885998f24bf0c20d1b714d7fc60bb78c8e7d4c9b53c707e8956b1160f8' 
  AND token = 'xQ46tOhROd7hBqHAvKO6Fr3HG7qkI5NDJ5e7q7Xnv6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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