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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503ec3bdbffce251a398a7366cfeb2c74d7341e973b832150ef19cc426b73167' 
  AND token = '3rp2ao9ZfTTMahdOA9QY9FVuWZjFt9eP3kmu6COPli0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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