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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bec71948de668818abf8ade206af0eef80ed21aa722c65c0ed0da33376f0d62' 
  AND token = 'vwVBHadwogQ4wcZBPMaNYeTf2PvOk1sY7GqY13dRGcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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