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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32cab348d9a2199aa6bbdb3cbbb9a12a07aa646651f8db663785f8b48225afc' 
  AND token = 'cV3+B6XFMGLw/XFnQhParPRzwr1cEebFN4JmgBH05Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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