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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa224f5752c7c746feb4dd4a3e196ad5af18ed68d0beefa1310d88003c235856' 
  AND token = '9m63aULtP3m8+gXTQFcos5Ee37WBWLly0GSi+THJDK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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