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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b82dd2f150c1d5d33cc51ae9a62524838ac03811a00d8b547cb92b4d063ed83' 
  AND token = '6ISRJl3cYe8g0KJtuSPCSx0TpJTeOV9fIFF1abEVuXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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