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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8f82200ea75c8b58757706f2626040d4a798b0e1db2450d56df37767842e99' 
  AND token = 'RQbtBuVGntGLcIXp3D/dLw26AbycmWM/pSxbw3PJBAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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