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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a208ae1e4466cc2762bef0288ed54c269dceed9679cfe59360ecde7e0b8192' 
  AND token = '6+hrcNRzBjZgZ8hsYCssg0hjI85Au0GoEXpIDhCM6+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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