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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea93dee170ac0f4f5ff92d1c018446abf6340a528c3110db70eea8640d28ca45' 
  AND token = 'nlmaal6mirFS6JU9kCj7vX/jBlve0fCFPnM4g4iEkOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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