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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef88e90223b738a022466a0914cb3fe2233b2454afca2bc9cf4bd60de9f1cb0' 
  AND token = 'fGvjzU/Nl+aUEc2oP7q00DTJ/B2PrIkl60eCNKW/QAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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