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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02679b6d73251fd264539692030862a881a3f36d9d8dc9a0327fc1f0db4fe40c' 
  AND token = 'YlnngpGE4ge5B3axgOn8xcSEjWj0QWWlnUeBwOfE5BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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