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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '135103be30fd3b214767e8ef69889ab172109b6c1c96b54af12d12c5f411de31' 
  AND token = 'R7PVN9p0N3dTlRZ8J2V1rcSP75Ru4k3mO+4dWWuO400=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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