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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9562bcb72932274cfe1d5b4ac155274cb83938b28e2fc72c71144c3dd73fb8' 
  AND token = 'hqOa/yLwCw7m4fpNYUW1DvE+S/LED19tvffDxQuG1Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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