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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13bd0252dbec1016ade8ead27a0a60173d18f090d1c13b52e6cc2d7cd0da894b' 
  AND token = 'BfCObMbEXQq3fjP0vZigFJNuOzEH7sXAWH5B5E+/OMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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