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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e12298d1f3dbe2a55b3d474db16258d432354f5a037abb8355ec06f69e7d472' 
  AND token = 'iMbwwRBRhilEEq5ZRn8e2xZl3Ci3fX9eTjAJXVcIj8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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