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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889ec1a2f21fd166c46dc18f1a7f81187aa9ab0a7a3040d52a06f3da70b9a3c4' 
  AND token = 'crwHuc/GElhoOFaN7i4QUXuFtMtypzG3FT9brijKbwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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