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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9a2d3a320ef5ab5bec0f0dfd99b3f46656d815591f060b15a6373450d1ef08' 
  AND token = '99Rwz23yUTYO8IRsFmUWshf86PvTaOMMr2Q0FyhO6+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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